feat (Conversation/e2e): Validate authentication from webhooks (#145)

* feat (Conversation/e2e): Validate authentication from webhooks
* feat (Core): Add guard against 'null' key value for headers comparison

.github/workflows/build.yml

@@ -41,11 +41,6 @@ jobs:
           fetch-depth: 0
           path: sinch-sdk-mockserver
 
-      - name: Build custom Docker image
-        run: |
-          cd sinch-sdk-mockserver
-          docker build -t sinch-sdk-mockserver -f Dockerfile .
-
       - name: Install Docker Compose
         run: |
           sudo apt-get update
@@ -56,11 +51,6 @@ jobs:
           cd sinch-sdk-mockserver
           docker-compose up -d
 
-      - name: Wait for the mock servers to be healthy
-        run: |
-          cd sinch-sdk-mockserver
-          . ./scripts/healthcheck.sh
-
       - name: Link to feature files
         run: |
           ln -s ${{ github.workspace }}/sinch-sdk-mockserver/features client/src/test/resources

client/src/main/com/sinch/sdk/domains/conversation/api/v1/adapters/ConversationWebhooksAuthenticationValidation.java

@@ -1,6 +1,7 @@
 package com.sinch.sdk.domains.conversation.api.v1.adapters;
 
 import com.sinch.sdk.core.exceptions.ApiAuthException;
+import com.sinch.sdk.core.utils.MapUtils;
 import java.nio.charset.StandardCharsets;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
@@ -22,8 +23,9 @@ public class ConversationWebhooksAuthenticationValidation {
   static final String SIGNATURE_HEADER = "x-sinch-webhook-signature";
 
   public boolean validateAuthenticationHeader(
-      String secret, Map<String, String> headers, String jsonPayload) {
+      String secret, Map<String, String> _headers, String jsonPayload) {
 
+    Map<String, String> headers = MapUtils.getCaseInsensitiveMap(_headers);
     String timestampHeader = headers.get(TIMESTAMP_HEADER);
     String nonceHeader = headers.get(NONCE_HEADER);
     String algorithmHeader = headers.get(ALGORITHM_HEADER);